Saturday, September 4, 2010

Fw: Re: [MW:6859] acceptance criteria of DPT-with added points

Hi,

Pls.find the procedure for temp.less than 5 degrees as per ASME section-V.

 

T-653 Techniques for Nonstandard

Temperatures

When it is not practical to conduct a liquid penetrant

examination within the temperature range of 40°F to 125°F

(5°C to 52°C), the examination procedure at the proposed

lower or higher temperature range requires qualification

of the penetrant materials and processing in accordance

with Mandatory Appendix III of this Article.
Appendix-III

TECHNIQUES FOR EXAMINATIONS

AT NONSTANDARD TEMPERATURES

III-610 SCOPE

When a liquid penetrant examination cannot be conducted

within the standard temperature range of 40°F to

125°F (5°C to 52°C), the temperature of the examination

shall be qualified in accordance with this Appendix.

III-630 MATERIALS

A liquid penetrant comparator block shall be made as

follows. The liquid penetrant comparator blocks shall be

made of aluminum, ASTM B 209, Type 2024, 38 in.

(9.5 mm) thick, and should have approximate face dimensions

of 2 in. 3 in. (50 mm 75 mm). At the center

of each face, an area approximately 1 in. (25 mm) in

diameter shall be marked with a 950°F (510°C) temperature-

indicating crayon or paint. The marked area shall be

heated with a blowtorch, a Bunsen burner, or similar device

to a temperature between 950°F (510°C) and 975°F

(524°C). The specimen shall then be immediately quenched

in cold water, which produces a network of fine cracks on

each face.

The block shall then be dried by heating to approximately

300°F (149°C). After cooling, the block shall be

cut in half. One-half of the specimen shall be designated

block "A" and the other block "B" for identification in

subsequent processing. Figure III-630 illustrates the comparator

blocks "A" and "B." As an alternate to cutting the

block in half to make blocks "A" and "B," separate blocks

2 in. 3 in. (50 mm 75 mm) can be made using the

heating and quenching technique as described above. Two

comparator blocks with closely matched crack patterns

may be used. The blocks shall be marked "A" and "B."

III-640 REQUIREMENTS

III-641 Comparator Application

III-641.1 Temperature Less Than 40°F (5°C). If it is

desired to qualify a liquid penetrant examination procedure

at a temperature of less than 40°F (5°C), the proposed

procedure shall be applied to block "B" after the block

and all materials have been cooled and held at the proposed

examination temperature until the comparison is completed.

A standard procedure which has previously been

demonstrated as suitable for use shall be applied to block

"A" in the 40°F to 125°F (5°C to 52°C) temperature range.

The indications of cracks shall be compared between blocks

"A" and "B." If the indications obtained under the proposed

conditions on block "B" are essentially the same as

obtained on block "A" during examination at 40°F to 125°F

(5°C to 52°C), the proposed procedure shall be considered

qualified for use. A procedure qualified at a temperature

lower than 40°F (5°C) shall be qualified from that temperature

to 40°F (5°C).


Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Sat, 9/4/10, Karthik <karthik6684@yahoo.com> wrote:

From: Karthik <karthik6684@yahoo.com>
Subject: Re: [MW:6847] acceptance criteria of DPT
To: materials-welding@googlegroups.com
Date: Saturday, September 4, 2010, 1:49 PM

HI,
Temperature limit as per ASME Section SecV,shall be as follows.

T-652 Techniques for Standard Temperatures

As a standard technique, the temperature of the penetrant

and the surface of the part to be processed shall not be

below 40°F (5°C) nor above 125°F (52°C) throughout the

examination period. Local heating or cooling is permitted

provided the part temperature remains in the range of 40°F

to 125°F (5°C to 52°C) during the examination. Where it is

not practical to comply with these temperature limitations,

other temperatures and times may be used, provided the

procedures are qualified as specified in T-653.
Acceptance criteria:
It shall be as per ASME Section-VIII,Div1-Appendix-8.In no case temperture shall be less than 5 degree celsius for LPT.If the surface temp.is less than that it shall be heated to maintain the temp.limit as per code.
Thanks & Regards,
 
(karthik)
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Thu, 9/2/10, puneet takiar <puneet1takiar@yahoo.com> wrote:

From: puneet takiar <puneet1takiar@yahoo.com>
Subject: Re: [MW:6847] acceptance criteria of DPT
To: materials-welding@googlegroups.com
Date: Thursday, September 2, 2010, 10:41 PM

Dear Sir,
 
What will be the acceptance criteria for LPT of jobs at lower temprature than 10 degree celcius.
Regards
 
puneet takiar



From: PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com>
To: materials-welding@googlegroups.com
Sent: Fri, 27 August, 2010 10:28:25 PM
Subject: Re: [MW:6749] acceptance criteria of DPT


Hi

If your construction code is ASME Sec VIII Div.1, then refer Mandatory Appendix 8 for LPT acceptance criteria.

The acceptance standards mentioned in ASME Sec VIII Div 1, 2007 edition are:

All surfaces examined shall be free from :
Relevant linear indications ( greater than 1.6mm)
Relevant Rounded indications greater than 5mm.
Four or more relevant rounded indications in a line separated by 1.5mm or less (edge to edge).

Regards

Prem Nautiyal

On Fri, 27 Aug 2010 09:07:43 +0530 wrote
>HI FRIENDS,
CAN ANY BODY TELL ME ABOUT THE ACCEPTANCE CRITERIA OF DPT ?ACCEPTANCE RANGES OF DEFECTS LIKE UNDERCUT,PORE,POROSITY,CRACK,etc.thanks
 
Regards
M.Aslam Khan
QA/QC ENGINEER



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PREM S NAUTIYAL
CELL : 9820313278
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